The door is open, come on in … to the new Shake Shack at 1 Old Fulton St., next to Brooklyn Bridge Park. Eagle photos by Lore Croghan

By Lore Croghan

Brooklyn Daily Eagle

Lookin' good, Shake Shack!

Big-time foodie Danny Meyer's new burger palace next to Brooklyn Bridge Park was busy, busy, busy on its first weekend in business.

The spanking-new Shake Shack in the landmarked Fulton Ferry Historic District was packed to the gills Saturday, with customers waiting in long lines to order all-natural Angus beef hamburgers and hand-cut fries.

Newly hired workers were pumped up with enthusiasm for their new gigs at the 1 Old Fulton St. gourmet fast-food joint, which opened last Tuesday.

“Danny Meyer is a genius,” gushed a greeter at the front door, who was passing out menus to arriving customers. “I'm reading his book.”

(The restaurateur's most popular tome is “Setting the Table: The Transforming Power of Hospitality in Business.”)

One of the concretes is called “Caramel Carousel” in honor of Jane's Carousel in neighboring Brooklyn Bridge Park.

The Old Fulton Street Shake Shack is the second to spring up in Brooklyn. The first, which opened in December 2011 on Downtown Brooklyn's Fulton Mall, a stone's throw away from Brooklyn Borough Hall, is busy at whatever hour of day or night this Brooklyn Eagle reporter stops by for a French-fry fix.

A third restaurant is well under construction on Flatbush Avenue across from Barclays Center.

The newly open Shake Shack sits in the shadow of the Brooklyn Bridge, in a prime location seen by visitors to DUMBO as well as those heading in or out of the Pier 1 entrance to Brooklyn Bridge Park.

The 3,200-square-foot restaurant, which is inside a historic building that belongs to the Walentas family's Two Trees Management, has two spacious rooms for customer seating. One of them has a fireplace — which will come in handy when winter winds come howling off the East River.